Sock Merchant || HackerRank

SockMerchant.java

    static int sockMerchant(int n, int[] arr) {
        Set<Integer> colors = new HashSet<>();
        int pairs = 0;
        if(n == arr.length){
            for (int i = 0; i < n; i++) {
                if (colors.remove(arr[i])) {
                    pairs++;
                } else {
                    colors.add(arr[i]);
                }
            }
        }
        return pairs;
    }